Jig saw



Oct. 6, 1931. A v P|cKER|NG 1,826,187

JIG SAW Filed Jan. 17, 1929 3 Sheets-Sheet 1 v wlqezfpc cierlby w fM Oct. 6, 1931. A. v. PICKERING JIG SAW 3 Sheets-Sheet 2,

Filed Jan. 17; 1929 r w. r

1931, A. v. PICKERING 1,826,187 I JIG SAW Filed Jan. 17, 1929 3 Sheets-Sheet 3 Patented Oct. 6, 1931 P cer en er vr crEB Ne 9 messes-ism BHQPE let se es etwe is? MESNZE e ewlt- Meme TQ-QRTA.B@E.?1L;ECT.P.-IQ T0933. ees eeelem 9 EITCHBUIYG: m smerwe e A eroeeemi QF tweetsi are sew I -A pplication filed January 17, 1929. sex er No. 332,191.

to p ovide a c n ucti n whi h per y mot r at a h ghepe d n w ich th s I it e f ecip oca in a st ight line, a ho g .dr yen by' a rotary l me t; PIQViQ Q a .9 struction which xyillstart the hole itself and i there are no holes to drill; to provide a conetraction in which e sa ta le wil n chatter but the saw will. run smoothly ta-. times; to provide means whereby the saw can he applied, tothe w r th iniu g thehsaw or the plate or. sheet being out; to

providean improyed saw blade thereiOl, and .espjeciallyto provide a construction which ,Willcut the labor costs of this kind of Work.

' Qther. objects and advantages of the in- Ventionwill appear hereinafter.

Reference is to hev had to the accompanying drawings inwhich *Fig. lis aizplan of a machine constructed a in accordance With this invent-ion, showing it restinglon thezxvork and showing a sample of the Work that can be done;

. Fig. 2-is a side elevation of the same showing theframes liftecL'before the sa Wingoper- I ation starts;

Fig. 3 is a sectional viewon the horlzontal line ofJFig. 2 7 Fig.4 is a view like Fig. 2 With the mal '11 trestin 'on the Work read. for saWin C11 8 b y bi .On the bottom otthe tool slide 21 it is prov dedwith ayertical depression in which and with .parts'in section;

Fig. 5 is a sectional VlGW on the l ne 5-5 oflFig. 4;

JFig. 6 is a sectional View on the line 6-1-6 of-Fig; 4; i Fig. 7 is aseotional Viewv on'thelme 7.-'''(' or Fig. 1;

Fig. 8. is a side View as indicated by-the- P arrow 8 in Fig.7

Fig.9. is a side View, of an .electrioswitch a P Which is preferredto be employed w th this device, with the front ,plate removed and V Figs. '10 and .11 are. opposite edge vi ws of thefsame as indicated by the arrows 10 a and; 11- in Fig. 9.

The. invention is shown as comprising. a -:'ilat-bottomed baselO, preferably of aluminum so that it can he lifted. around readily largeeiioughso as to provide a substant al support for the mechanism. -On this we i maim le f te 1, nd. te ra w th it s cast a frame 12. on themotor with. a spiral gear let, bothheirig termed of or some noiseless, suhstance. The gear 14, is mounted on ashaft carried by the frame 12 and is provided withfan eccentric" pin 16 on the inner Side here it is protected by part of the; frame fr m. an eQ Sihle ier-y tethe p b it a point on the framefat the rear is pivoted ahar 17, which has a SlotllS 031 re- .c eiy in g the pin 16. Thereforelithe rotation pt the gear will oscillate thehar about its .p1yotstud l9. The free end ofthis pivoted ..bar is .proyided' with two piyoted links. 20

carrying pin 22 which passes through a' vertical j-cutter slide Therefore this cutterv will be reciprocated by theoperation of the parts previously described.

cutter slide is mounted to reciprocate erticall h d eg st me o i a y other direction by twopairs ofgrooved rolls mounted in the frame 12, which hasslots for that purpose. Thesefrolls are held in proper position 'by studs 25L onflwhich'the rolls are free to turn and on the outsides of -=the.ro1ls are ashers 25 held inposition by these 91 15 Th 'glfeeves roll recei e the. opposite edgesofthe tool slide. i

it is, 1=11 ted to .receive the upper end of a W lad flei h s up e nd being hare -ly loonneetedtofit by means of a b015- assi-ng through the blade and theslide.

.The e lede is e i w th a ha p end- 28 ad t t b tt itS y i a Pie o wood Without previous. drilling thereof.

In the preferred form the blade is 'provided with. l er ete he t a d beet- 11th, te t being sharp. and set as in all wood-saws.

. Th re r edge s. rei htend r a and bears-on eneth snide 19 hi h 1 19 [it up a d h l s iti n y PQSi Qn- Th constitutes a very effective blade for working on wood and on account of the rapid reciprocation of the slide and the rigid connection of the blade therewith and particularly on account of the nature of the saw blade just described, this blade will quickly provide a hole through the wood and then, while it is running, the operator can move the whole machine around on the wood to provide a curved cut of any desired character as indicated at in Fig. 1.

In order that the blade need not be injured or the material on which it is placed by putting the frame down on it, I have provided a lifting device comprising a cylinder 31 integrally or otherwise fixedly connected with the frame 12 and having a cylindrical passage in it. In this passage is a pin 32 having a head on the bottom. The head is adapt ed to rest on the'work and a spring 34, which surrounds the pin and engages a collar 35 on the pin, normally forces the pin down where the head will be below the plane of the bottom of the base 10, as shown in Fig. 7. \Vhen the machine is to be placed on the work the operator moves it to the proper place, the soring holding the frame and saw up. When he gets it in the proper place he grasps the cylinder 31 in his hand or a handle and forces it down to the work which forces the lower head up into the socket 29. The pin 32 can be held up by turning it, when raised, so a cross pin 36, normally sliding in slots 56 will be received in notches 57 at right angles thereto. The pin 32 is raised in the base by forcing the base down flat on the work, thus COIHPIGSSlDg the spring 34 and bringing the cross pin 36 up to the level of the horizontal notches 57. Then the head at the top of the pin 32 is turned. No further attention is paid to this l'j ing device.

In inclined position on the side of the frame is a handle 53 for the left hand. It is made separate and secured to the frame by bolts 54.

At the rear of the frame 12 I have shown a handle by which the operator manipulates the machine to move it around the flat surface on. which it is located. This handle comprises an inclined member 37 integral with the frame 12 and having a space therein in which is located an electric switch 39. This is for the purpose of connecting one of the leading wires e0 with one of the wires 41 which goes to the motor. These wires are secured to two metallic terminals 42 by binding screws. These terminals are mounted on two insulating plates 43 in stationary position and they project outwardly in opposite directions forming a pair of oppositely in clincd walls. These terminals also are in the form of springs.

The switch also comprises a metallic frame 44 on which is pivoted a trigger operating member 45 normally pressed upwardly by a spring 46. To it is pivoted a lever 47 having contacts &8 which are connected with each other. \Vhen the trigger 45 is pressed down the contacts 48 are forced between the springs 12 and connect the two lines so that the motor will be operated. A spring 49 assists in bringing the lever 17 back out of the way against a stop 50. The extreme end 0 the lever engages a projection or stop 51 on the frame 44 when the contact is made to prevent its moving beyond that position. The two springs 46 and 49 force the parts up into non-connecting position when the trigger is released. The trigger is located on the inner side of the handle where the operator can press it or release it during the operation as he sees fit.

The several features of the invention have been described in full and their advantages stated. Although I have illustrated and described only one form of the invention, I am aware of the fact that modifications can be made therein by any person skilled in the art without departing from the scope of the invention as expressed in the claims. Therefore, I do not wish. to be limited to all the details of construction herein shown and described, but what I do claim is 1. In a jig saw, the combination with a supporting base adapted to be moved freely on the surface of the material to be sawed, of a pivoted bar, a reciprocable slide pivotally connected with the bar, a saw blade carried by the slide, means for rapidly oscillating the bar to reciprocate the slide, and a bearing and guiding roller located at the back of the saw at a point close to the bottom of the base, said roller having a groove for receiving the slide and saw.

2. In a jig saw, the combination with a base, a motor mounted on the base and a frame carried by the base and having means thereon for operating a saw from the motor, of a headed pin reciprocably mounted on the frame in vertical position near the saw, and having a spring for lowering its head below the bottom of the base, whereby when the saw is projected a short distance below said base the frame can be moved around on a surface to be sawed and the saw held out of operative position by said pin, said pin having a. second head fixed to its upper end and adapted to be turned to turn the pin, a cross pin on said pin, the base having a transverse groove for receiving the cross pin, whereby, when turned from normal position, the firstnamcd pin will be held up so as not to project through the bottom of the base, thus allowing the entire base to rest flat on the work.

3. In a jig saw, the combination with a base, of the motor mounted on said base, a wheel rotatably supported by said base and geared to the motor, said gear having an eccentric pin, a pivoted oscillatable bar having a longitudinal slot, a sliding block in said slot having a perforation receiving said pin whereby said bar is oscillated, a reciprocable slide pivotally connected with the end of the bar, means on the frame for guiding the slide to move'vertically, and a saw fixed. on said slide. r

In testimony whereof I have hereunto affixed my signature.

ALBERT V. PIGKERING. 

